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LM2576S-ADJ/NOPB

TILM2576S-ADJ/NOPB

Texas Instruments
Adjustable 3A buck regulator for higher output current needs
NRND3,583 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The LM2576S-ADJ/NOPB is a monolithic integrated circuit that provides all active functions for a step-down (buck) switching regulator, capable of driving a 3A load with excellent line and load regulation. It features an adjustable output voltage starting from 1.23V and operates at a fixed switching frequency of 52kHz. This device is designed to minimize the number of external components, simplifying power supply design by requiring only a few standard inductors and capacitors.

Why Choose This Part

The LM2576 series offers a high 3A output current capability and internal thermal shutdown for robust fault protection. Its 52kHz fixed frequency allows for predictable EMI characteristics, while the low 50uA standby current in shutdown mode helps conserve power in idle states.

Applications

High-Efficiency Step-Down Regulation
Providing a robust 3A output for local on-card regulation from higher voltage rails.
Battery Charger Circuits
Utilizing the adjustable output to meet specific battery chemistry termination voltages.
Pre-Regulator for Linear Regulators
Efficiency improvement by dropping high input voltages down to a lower intermediate voltage before final linear regulation.
Positive-to-Negative Converters
Configuring the buck topology into an inverting buck-boost for negative voltage rails.

Key Specifications

Function Step-Down
Topology Buck
Output Type Adjustable
Mounting Type Surface Mount
Package / Case TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Current - Output 3A
Number of Outputs 1
Output Configuration Positive
Frequency - Switching 52kHz
Operating Temperature -40degC ~ 125degC (TJ)
Synchronous Rectifier No
Voltage - Input (Max) 40V
Voltage - Input (Min) 4V
Voltage - Output (Max) 37V
Supplier Device Package TO-263 (DDPAK-5)
Voltage - Output (Min/Fixed) 1.23V

Getting Started

When designing with the LM2576S-ADJ/NOPB, ensure the DDPAK package is soldered to a large copper plane to manage heat dissipation at the full 3A load. Use low-ESR capacitors and place the input bypass capacitor as close as possible to the VIN and GND pins to minimize voltage spikes. Reference the TI datasheet for the specific inductor selection guide based on your input voltage and maximum load current.

Part of LM2596 / LM2576 Switching Regulator family » LM2576S

LM2576S Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Output Type Output V Stock
LM2576S-ADJ/NOPB (this part) Adjustable 1.23V 3,583
LM2576S-5.0/NOPB Fixed 5V 5,888

Also Consider

LM2596S-ADJ/NOPB TITexas Instruments - A newer generation replacement with a higher 150kHz switching frequency, allowing for much smaller inductors and capacitors.
LM2576T-ADJ/NOPB TITexas Instruments - The TO-220 through-hole version of this regulator, ideal for mounting to external heatsinks in high-heat applications.

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